Timepiece with chronograph



June 16, 1953 g R. n. JEANNERET 2,641,900

TIMEPIECE WITH CHRONOGRAPH Filed Nov. 29, 1951 NTO R:

Patented June 16, 1953 2,641,900 TIMEPIECE WITH CHRONOGRAPH Robert H. J eanneret, Saint-Imier, Switzerland, assignor to R. J eanneret & 00., Excelsior Park, Saint-Imier, Switzerland, a firm Application November 29, 1951, Serial No. 258,796 In Switzerland January 10, 1951 3 Claims.

The present invention has for its object a time piece with chronograph including at least one chronograph lever with an associated controlled clutch. The essential feature of this improved time piece consists in that the chronograph lever carries an elastic member that moves substantially in radial relationship with reference to the chronograph wheel and that is adapted to come into contact with said wheel in order to brake the latter when the chronograph is disconnected.

Accompanying drawing illustrates, by way of example, a preferred embodiment of my improved clockwork. In said drawing:

Fig. l is a plan view of the time piece.

Fig. 2 is a detail view of Fig. 1 on an enlarged scale.

Fig. 3 is a cross-section through line III-III of Fig. 2.

Fig. 4 is a cross-section through line IVIV of Fig. 2.

The improved time piece illustrated includes a chronograph with a minute counter. The chronograph wheel is shown at I while the wheel of the minute counter is shown at 2. The drive of the chronograph wheel I is performed through the agency of a transmission 3 carried by a lever 4, which latter is pivotally carried at 5 and is controlled directly by the column Wheel 6. The counter wheel 2 is controlled by a transmission gear I carried by a lever 8 pivotally secured to an eccentric part 9 having a slotted head and fitted with slight friction into the clockwork base plate. The lever 8 is in turn controlled by the lever 4. To this end, it is provided with a tongue 8w folded upwardly and cooperating with an eccentric I secured to the lever 4. Said eccentric I0 allows modifying the relative position between the levers. The head of a screw II prevents any rising movement of the levers 4 and 8 to either side thereof.

A yielding blade I2 is secured through a rivet I3 to the underside of the lever 8. Said blade is cranked and the arm secured to the lever forms a very small angle with the latter so as not to engage the surface thereof throughout its length which would result in a reduction of the yieldingness of said elastic blade. The free end of this blade I2 is adapted to engage the underside of the chronograph wheel I so as to brake said wheel when the chronograph is disconnected. The blade I2 is secured to the lever 8 at a point such that it executes substantially radial movements with reference to the chronograph wheel.

The blade I 2 is sufficiently elastic for the pressure exerted by it on the wheel I to be very small. When the chronograph is returned to zero, the return to zero lever I4 cooperating with the heart-piece I produces an action overcoming the braking action, so that the wheel I rotates while frictionally engaging the blade I2.

The spindle forming the eccentric part 9 round which the lever 8 is adapted to pivot allows through its eccentricity providing through an angular movement for a slight modification of the position of the lever, which moves the blade I2 further away from the wheel I or nearer thereto, without modifying substantially thereby the location of the transmission gear I.

It is also possible to secure the member braking the movement of the time chronograph wheel to the lever controlling said wheel. It is necessary for this arrangement to be possible for a point of the lever controlling the chronograph to execute radial movements with reference to the chronograph wheel.

What I claim is:

1. In a time piece with chronograph including a chronograph wheel, the combination of at least one lever operatively connected with said wheel, a clutch associated with said wheel, a yielding member controlled by said lever and adapted to move in a direction that is substantially radial with reference to the chronograph wheel and to engage frictionally the latter to brake it when the clutch is inoperative, an eccentric to which said lever is pivotally secured and the angular position of which defines the relative position of the elastic member with reference to the chronograph wheel.

2. In a time piece with chronograph including a chronograph wheel, the combination of at least one lever operatively connected with said wheel, a clutch associated with said wheel, a minute counter, a second lever controlling same and controlled by the first lever and a yielding blade carried by the second lever and adapted to move in a direction that is substantially radial with reference to the chronograph wheel and to engage frictionally the latter tobrake it when the clutch is inoperative.

3. In a time piece with chronograph including a chronograph wheel, the combination of at least one lever operatively connected with said wheel, a clutch associated with said wheel and a yielding member carried by said lever and adapted to move in a direction that is substantially radial with reference to the chronograph wheel and to engage frictionally the latter to brake it only when the clutch is inoperative.

ROBERT H. J EANNERET.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 278,127 Goy May 22, 1883 378,592 Jeannot Feb. 28, 1888 FOREIGN PATENTS Number Country Date 6,169 Switzerland Dec. 22, 1892 9,974 Switzerland Feb. 1, 1895 

